An efficient porous molybdenum diselenide catalyst for electrochemical hydrogen generation†
The design and development of inexpensive and highly efficient electrocatalysts for hydrogen production underpin several emerging clean-energy technologies. In this work, we show a novel strategy to synthesize vertically aligned porous MoSe2 by a two-step co-electrodeposition/etching method. The morphology of the porous MoSe2 can be easily tuned by merely varying the Mo/Cu ratio. First, a matrix composite MoSe2/Cu3Se2 was prepared by electrodeposition and Cu3Se2 was subsequently etched to form porous MoSe2 structures. The obtained perpendicularly oriented porous MoSe2 material exhibits an excellent electrochemical hydrogen generation catalytic performance without the need for a material transfer step. This designed architecture based on an oriented vertical structure possesses fully exposed active edges and open structures for fast ion/electron transfer, leads to remarkable HER activity with a low onset potential of −0.10 V vs. the RHE (reversible hydrogen electrode), a small Tafel slope of 46 mV per decade and excellent long-cycle stability. This work opens up a new class of nanomaterials for the development of efficient hybrid HER catalysts.